<template>
   <el-container class="home-container">
        <!--头部区域-->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!--页面主体区域-->
        <el-container>
            <!--侧边栏-->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <!--侧边栏菜单区域-->
                <el-menu background-color="#545c64" text-color="#fff" active-text-color="#409EFF" :unique-opened="true" :collapse="isCollapse" :collapse-transition="false" :router="true" :default-active="activePath">
                    <!--一级菜单-->
                    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                        <!--一级菜单的模板区域-->
                        <template slot="title">
                            <!--图标-->
                            <i :class="iconsObj[item.id]"></i>
                            <!--文本-->
                            <span>{{item.authName}}</span>
                        </template>
                        <!--二级菜单-->
                        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                            <template slot="title">
                            <!--图标-->
                            <i class="el-icon-menu"></i>
                            <!--文本-->
                            <span>{{subItem.authName}}</span>
                        </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!--右侧内容主体-->
            <el-main>
                <!--路由占位符-->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data () {
        return {
            // 左侧菜单数据
            menulist: [],
            iconsObj:  {
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao'
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的鏈接地址
            activePath:''
        }
    },
    created () {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout () {
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
        // 获取所有的菜单
        async getMenuList () {
        const { data: res } = await this.$http.get('menus')
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        console.log(res)
        },
        // 点击按钮，切换菜单的折叠与展开
        toggleCollapse () {
            this.isCollapse = !this.isCollapse
        },
        // 保存鏈接的激活狀態
        saveNavState (activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}

.el-aside {
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}

.el-main {
    background-color: #eaedf1;
}

.iconfont {
    margin-right: 10px;
}
.toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}


</style>